Improvement in drag-sawing machines



A.-RANS0M`B. Drag SaWing-Maohne.

Patented July 30,1878.

MPEI'ERb4 PHom-LITHDGRAPMER. WASHINGTCN, D.

UNITED STATES PATENT OEEIGE.

ALLEN RANSOME, OF THE EUKESTONS, OLAPHAM COMMON, ENGLAND.

IMPROVEMENT IN DRAG-SAWING MACHINES.

Specification forming part of Letters Patent No. 206,404, dated July 30,DTS; application iilcd May '7, 1878.

To all whom it may concern.-

Beit known that I, ALLEN RANsoME, of the Eukestons, Clapham Common, inthe county of Surrey, England, have invented new and useful Improvementsin Machinery for Fellin g Trees, which improvements are fully set forthin the following specicatiou, reference being had to the accompanyingdrawings.

My invention relates to improvements in portable tree felling machineryworked by steam, of the class iu which the saw is connected dircctl ywith the piston-rod ot' the eugine.

I employ a steam-cylinder with a length of stroke equal to that ofthesaw, andthe saw is actuated directly by the steam-eylinder. The cylinderlies upon and is secured to a base plate or frame, which is so made thatit can be conveniently carried from place to place, and can be stakeddown to the ground at the foot of the tree to be felled. A portableboiler is employed to supply steam, and a tlexible steam pipe or hoseconveys the steam from the boiler to the cylinder. At each stroke thesaw is moved round a short distance, and so by degrees the saw is causedto pass through the tree from side to side. This is effected by mountingthe cylinder upon a pivot, and causing the cylinder to turn slowly roundonthis pivot. This turning motion may be given to the cylinder by meansof a worm gearing into a tooth-rack upon the cylinder, or by othersuitable arrangement of gearing upon the base plate or frame for turningthe pivoted cylinder horizontally upon said frame.

In order that my said invention may be most fully understood and readilycarried into effect, I will proceed to describe the drawings hereuntoannexed.

Figure 1 is an elevation, and Fig. 2 is a plan, of the machine.

a a is the bed-plate. It is adapted to abut at one end against the treeto be felled, and at the other end there are two holes formed in it toreceive two pegs, b b. These are driven into the ground in properpositions before the bedplate is placed. b are collars passed throughthe heads of the pegs b. c c are two chains xed to a cross-head, al, andpassed between the guide-pulleys a2 a2, and so around the tree. The endsof the chains are hooked together at c', and they are drawn tight by thebolt d, passing from the cross-head al through the end of the bed-plate,where it receives a nut, d.

e is a steam-cylinder, with its pistou c and rod e?. (Shown with otherparts in section at Fig. 3.) The cylinder is connected with thebed-plate by a pivot, f, and guides g g, which leave it free to turnthrough an are ot' consid erable size. The pistou-rod is attached to across-head, 71. It works on guide-bars fixed to the cylinder-cover, andthe buckle fi', hohling the saw i, is also attached to it. The saw worksbetween adjustable packings at k.

The steam is admitted to and allowed to escape from the cylinder bymeans of a semiA rotary valve. (Shown in section at Fig. 4.) It is heldin its seat by the pressure of the steam, and is turned by means of thespindle l, which has an arm, l', upon it, and this is connected by thelink m (seen in the end view, Fig. 5) with a lever, a. The lever u iscarried by a bracket, f', on the side of the cylinder c, and the boss ofthe lever is slotted for the twisted bar o to pass through it. The bar ois attached to the crosshead l1, and, moving with the pistoured, gives arocking motion to the lever n, and the necessary semi-rotary motion tothe valve.

To press the saw up to its work there is a toothed are, p, fixed to thecylinder, and with this a worm, q, engages. r is a wheel on the axis ofthe worm, and s is a hand-lever, with a griping-pawl, s', upon it.-There isv another 1ocking-pawl at t, and both the pawls take hold ofthe wheel r in such manner that by moving the levers to and fro the wormcan be rotated and the saw kept up to its work.

Portable tree-felling machinery worked by steam is old, and is not,therefore, broadly claimed herein; nor do I claim, broadly, suchmachinery having the saw connected directly with the piston-rod, andcapable of moving into the cut as the sawing of a tree progresses, asthis is old; so also is an adjustable or turning cylinder, and I do notclaim such a cylinder per se.

Having thus described the nature of my said invention, and the manner ofperforming the same, I would have it understood that I claim- 1. Thecombination, substantially as herechinery, of the bed-plate or frame,adapted to inbefore set forth, in portable tree-felling marest Hat uponthe ground and be held up to the tree to be felled, the cylinder pivotedupon the frame, the piston, the saw attached vto the piston-rod, anddevices, substantially such as described, for turning the pivotedcylinder upon the fra-me, for the purpose specied.

2. The combination of thebed -plate or frame, the pivotedhorizontally-turning cylinder, its guides, and the toothed are,substantially as and for the purposes set fort-h.

3. The combination of the bed plate or frame, adapted to abut at one endagainst a tree to be felled, and to be staked down to the ground, theturning cylinder, the saw operated by the piston, the cross-head al,adjustable lengthwise of Jthe bed-plate, the chains, and theirguide-pulleys, these members being constructed and operating`substantially as hereinbefore set forth.

4. The combination', substantially as hereini before set forth, ofthebed-plate or frame, the turning cylinder, the piston, the saw attachedto the piston-rod, the cross-head h, also attached to the piston-rod,the guide-bars on which the crossfhead Works, the bar 0, attached to thecross-head, the rotary valve, and the connections between the valve andsaid bar, y

ALLEN'nANsoMn.

`i ,nojs XV t )sse iu/ls. BERKLEY Harnais,

17 Gmcccz 1li-ch Street, London. JNO. DEAN 7 '1,7 Graceclnuch Street,London.

